The Aztec UltraVac is a propane powered concrete dust vacuum system, offering 300 CFM with a 28 sqft HEPA MicroClean filter. All of Aztec’s propane machines are powered by the CE, EPA, CARB, LEED and GS-42 certified PurePowerLPG 600 Series engine, as part of the WorkSmartTM system. Featuring cord-free operation and MicroClean filtration.